Electric meter.



G. A. SAWIN.

ELECTRIC METER.

AFPLIGATION FILED SEPT.13, 1906.

Eatentef NGV. L wy).

G. SAWINL ELECTRIC METER.

APPLICATION MLED SBPT-13, 190s.

Pafsem'd Nov. L EMG.

2 SHEETS-SHEET 2.

7 o allfuzhom it may concern.'

Be it known ,that I ,fGnoneE A. Sawlnya citizen of thcll'nited States, residing at Lynn, county of llssex, State-of Massachusetts, have invented certain new and uset'ul Improvements iirlllectric Meters,of which the 'following is aspecitication.

My invention relates to electric meters, and has't'or its objeictto provide an arrangement for reducing wear on the jewel'bcarings and tor eliminating creeping.

As is well known, we arof the jewels is increased by vibration due to external causes while there. is no load on the meter, and also, in induction meters, by the vibration of the disk due to the tield ot' the potential coil.

My invention in its broader aspects consistsl of providing means operative upon th cessation otcurrent flow through the current. coils of the meter for restraining the movable element of the motor from movement'. I accomplish this by providing the magnet winding in series with the coils of the motor with means controlled by the magnetl for frictionally b 'alting the movable clement. 'of the meter. lne convenient method ot accomplishing this result:I is to separate the shaft. and thrust bearing, either by lifting the shaft or by lowering the jewel away from the shaft.

A\nother feature ot' my invention consists in providing m ans for breaking the circuit ot the potential coils of the meter, when no current is flowing from the current coils. 'lhis results in a saving of energy, and in induction meters, preventsany tendency to vibration except that due to outside the meter.

My invention will be best understood by reference to the accompanying drawings, in whichl `igure 1 shows a front elevation of a meter arranged in accordance with my invention; Fig. 2 shows a. side ele 'ation of the saine, partly in cross section; Fig. 3 is a diagram ot' connections; and Figs. 4 and 5 show details of construction. y

ln the drawings A represents the potential coil and B the current coils of the meter which acting inductively on the disk produces rotation ot' the disk in the well known manner.' l) represents the damping .niagnets. The disk is shown with a. vertical shaft' pivoted with the thrust be: ring E. F reln'csent.' a magnet. coil in series with the i' v ELECTRIC METER.

` sieeicann of Lettersratentfj sAwIn, 'or yLYNN, MASSACHUSETTS, 'AssIGNoEQ ro' GENERAL ELECTRIC coMrAEvgn-'coltronarron or NEWYORK.

Patented 'Nim- 1, 1910.

- Appnmtibnmec yseptennaer 13, i906. semina. 334,433. f

current coils B, controlling a second magnet coil G. As long as current is flowing through coils B, that is as long as there is any load on the crcuit of the meter, the magnet coil I4` holds its armature retracted, thereby opening the circuit'of magnet G.

v Whenever no current is tiowing through thel coils B, the magnet F releases its armature,

thereby closing the circuit of coil (al. The

coil (i operates to brake the disk frictionally by withdrawng the thrust bearing if), so as to allow the disk C to drop on the motor elements of the meter, the damping magnets, or other support. A suitable arrangement of. the thrust bearing for permitting this operation is shown in Figs. ft and 5. rlhe armature of magnet (i carried by a pivoted member J, the end of which is forked shaped, and engages pins j, whch 'extend through slots in the tube l, and are. secured to the bearing E, which is vertically movable in the tube and is normally held raised by the coml rcssion spring il. Whenever the magnet (l is energized, it. dr..ws down its armature, pulling the member .t downward, which lowers the bearing l@ away trom the shaft and comprcssts sprng H. The spring returns the bearing into engagement with the shaft whenever the circuit, of magnet G is broken. llfith-this construction, wear et Ithe jewel due to vihration of the disk when not running is avoid-v ed, and creeping is also prevented. The magnet G may further be. employed to break the crcnit'ot` the potential coil by providing` its armature with a Contact K, in series with the potential vcoil A, as shown in Fie. By employingr this contact, energy is saved which would otherwise be wasted in the potential eoil,and also the tendency to vibration due to the field ot' the potential coil is removed.

lty will be understood that while I have described a preferred embodiment of my invention. my invention maybe embodied in many forms Without. departing from its spirit, and I aim in the'appended claims to corer all such embodiments as will be ohrions to those skilled in the art. lVhat. I claim as new and desire to secure by Letters Patent of the United States, is,-

1. ln lan electric meter having a-vertical shaft, a thrust bearing therefor and current coils, the combination with the vertical shaft and the thrustl bearing of means operative lib upon a cessation of curi'eut-llow through the current coils of the meter for Separating the i circuit ot the potential coil :unl for causing the movable elementy of the meter to be friccoils, the combination with the vertical shaft. f

and thethrust bearing, of means operative upon the cessation of current-flow through the current coils of said meter for lowering,I said bearing awav from the shaft.

In an electric mcter havingl current coils, a vertical shat't aiul thrust bearing therefor, a magnet: coil in Series with the current coils ot' the meter, and means controlled 'thereby for separating the shaft anil its l'iearing.

4. Iii an electric meter having;- current coils, a vertical shaft antl a thrust bearing therefor, a magnet coil in series with the current coils ot thc meter, aiul means controlled thereby for lowering laiil bearing away from the Shaft.

4 ln an electric meter having current coils, a potential coil, :incl a movable element, the combination with the current coils of means controlled b v the current flow through the current coils for opening the 6-111 an electric ii'ieter having Current coils, a potential coil, anden movable elcment` a magnet coil in series" with the current coils ot" the meter, and ireans controlled thereby for opening the circuit of the potential coil and for causing the movable element of the meter ,to be frictionally brakeil.

T. ln an electric meter having current coils, a potential coil, a vertical shaft. anil a thrust bearing therefor, a magnet'c'oil in series with the current coils ot' the meter. a secoiitl coil, means in operati@l relation with the first coil for energizing thewii'itling of the second coil. and means in operative re-4 lation with the second coil for loweringthe f bearing awa)v from the shaft and for opening the circuit of the potential coil.

ln witness whereof. 1 have hereunto sie@v 

